Followup for clarification on at ICF home with attic trusses. I do plan to insulate the attic truss floor for two reason. !st is for noise reduction and the other is that this area will only ocassionally be occupied and will have reduced temps most of the time. Can I get away with spry foaming the roof trusses soffit to soffit with 2" and then putting in batt insulation to fill the cavity. I do plan to very soon finish this area so do I also need to insulated the side walls of the room if the rafters are already filled with insulation.